Figure 5.

Plant immune response through the suppression of StSR4 expression is regulated by SA. (A) Quantification of free SA in three stsr4 mutants (stsr4_3-55, stsr4_3-19, and stsr4_1-278). Data represent the mean ± SE of five biological replicates. Asterisks indicate significant differences (Student’s t-test; **p < 0.01, ***p < 0.001). (B) Growth at 25°C for 3 weeks in pots of three mutants before pathogen resistance experiment. (C) Disease symptoms observed on the leaves of wild type and stsr4_3-55 and stsr4_3-19 mutant plants at 0 days post-inoculation (dpi) and 5 dpi with Phytophthora infestans. Leaves of wild type and stsr4 mutant plants grown at 25°C for 3 weeks were sprayed with a zoospore suspension of P. infestans strain 88069. At least three biological replicates were performed.